put widgets on existing theme

Hi! Is it possible to use one of these themes http://www.oswd.org/ as a base theme? I’ve put a theme under WebContent/VAADIN/themes/my_theme, renamed a css file like style.css, added @import “…/reindeer/styles.css”; as first line to my style.css file, called setTheme(“my_theme”) but the theme it’s not shown. I can see just a gray background :
As a second step, I’d like to put vaading widgets on my custom base theme. Is it possible?